Index for Android Open Source Projects. What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them? Android, GridView, Custom GridView, Custom Grid View Example in Android , Image and Text in GridView in Android , Gridview demo in Android,Android ListView Sectioned Headers in Android Sectioned headers in a list are great when you want to display categorized items eg. 4/26/2016 06:27:00 In Common Navigation Paradigms cliffnotes, we discuss the various navigational structures available within Android apps. 6/18/2017 05:37:00. Joyce Echessa demonstrates how the Android Design Support library can bring Material Design to older Android versions. codepath / android_guides. Creating a Navigation Drawer. 4/26/2016 06:21:00. 4/26/2016 06:21:00.